S.B.
There are too many variables involved in this scenario.
Your job doesn't start for a year. You may or may not be pregnant or may or may not have a child. You've only been offered a position, you aren't hired and that offer can be rescinded. LIke I said, since it doesn't start for a year, it depends on what you have in writing. I'm guessing not much, since you aren't even sure of the possible start date.
You're trying to juggle a job and a child you don't have yet.
That's hard to do. But I really wish you luck.
Things will turn out as they are supposed to one way or the other.